89 Brougham Dlegance Heater Issues

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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 89 Brougham Dlegance Heater Issues in Past Cadillac Vehicle Discussion; Hi Guys, I bought a 89 Brougham with the 307 4bl, only has 58`000KM original, the only issue is the ...
  1. #1
    JLanzino's Avatar
    JLanzino is offline Cadillac Owners Member
    Automobile(s): 1989 Cadillac Brougham d'Elegance
    Join Date
    Feb 2012
    Ontario Canada

    89 Brougham Dlegance Heater Issues

    Hi Guys,

    I bought a 89 Brougham with the 307 4bl, only has 58`000KM original, the only issue is the heater not working, the old fan was burned out, so I replaced it, still not working, but if I ground the new fan it will work with car on or off, this shouldn't happen right?

    Where would be a good starting place, any advise? I want to plate it but I need to repair this heater to get the safety

    Thanks guys

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  3. #2
    Robin Banx's Avatar
    Robin Banx is offline Cadillac Owners Enthusiast
    Automobile(s): 1983 FWB (Mac), 1981 SDV (Junkyard Dog)
    Join Date
    Dec 2007
    Vancouver, B.C. Canada

    Re: 89 Brougham Dlegance Heater Issues

    Sounds like the heater control module (on top of the heater box in the engine room) has failed. I've had the same problem with both of mine (81 & 83). Can still be found in wrecking yards for about $25.00.


  4. #3
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003

    Re: 89 Brougham Dlegance Heater Issues

    I'm confused? you have no blower or no hot air? Does it blow in the defrost mode? An inop. fan is usually the ground wire from the underhood power module. That ground wire goes to the center of the firewall by the hood bumper, Remove it and clean it. The motor itself screws into plastic and that screw can be loose, corroded preventing a good ground. If I recall the 307 had a hot water valve that requires vacuum to close it. Are the hoses to the heater core both hot?

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